Dear Mr./Mrs. [Name]
Due to the large quantity of applications received for the „[Stelle]“ position, it was an extremely difficult task to short-list candidates and, after careful consideration we have decided not to take your application any further.
If you are still interested in employment with [Unternehmen], all our vacancies are listed on our website, which is updated regularly.
I am sorry that we cannot help you on this occasion, but would like to take this opportunity to thank you for the interest you have shown in [Unternehmen] and to wish you every success with your future career.